Concrete Stress

PeterK

only if her butt is as wide as the semi.

Brian

Concrete Compression

I'm going to be quoting a 6000sq' mill where they make timber frame homes.The owner is concerned about the compression on the concrete with insulation under it with the radiant.Their forklifts can carry tons of beams at once.We're probably going just heat the perimeter of the floor and leave the centre clear but I was wondering if anyone had come across this before.

Thanks
Dobber

Mark Hunt

Yup


We did a 25k square foot garage a few years back for a heavy equipment company. Owner had the same concern.

I asked him what his concrete pour would be and he told me.(Something like 3000 lbs per square inch and the slab was 8" thick)

I told him that there would be no problem since the engineer said there wouldn't be. After all, he p[aid the engineer a HUGE sum of money to design this job!

Well......our tubing is in and the system has been running for 6 years with NO problems.

They can't crush the foam Dobber. They would have to collapse the concrete first and that WILL NOT happen.

Heat that place with tubes!

BTW, we did a 5000 sqft slab-on-grade motorcycle garage two years ago. It has been heated to complete satisfaction with ONE MUnchkin T-80!!! HAHAHAHAHAHAHA!

25 btu's/sqft my arse!!!!

Marshall's Motor Sports located on Rte.50 in Ballston Spa, New York. Drop by if you're in the area this winter. Leave your coat in the car!

Mark H

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hr

Me too

I did a heavy equipment shop with the same questions. I chose to go to a higher psi foam. I used the Dow Hi-load 60 psi. Typical foam is 25 psi, although some of the home center stuff is only 15 psi!

I have a friend that is a civil engineer. He helped explain that weight dynamic. I believe it is called a punching sheer, something like that. It calculates the amount of weigh a "point load" like a timber post on the square footage of concrete, or footing, it will contact. Same with weight from tire footprints.

I'd suggest a letter from an engineer also, to protect your interests. The radiant "guy" always gets the concrete issue put on his shoulders

Sometimes a rebar grid can be designed to spread out the load bearing. Perhaps higher psi concrete.

But it ALWAYS comes down to the compaction below the slab. Large commerial jobs, around here, with heavy loads contract a testing company to do a compaction test before the slab is poured. Be surprised how often they fail that test.

hot rod

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S Ebels

It's the psi is the thing..

As in pounds per square inch, whereas the floor loads are typically pounds per square foot. 25PSI x 144 sq" = 3,600 pounds per sq ft. on the insulation. That is one whale of a load considering the ability of the concrete to spread it over an area much greater than the actual point of contact from 4 tires. Believe it or not, a 130# woman wearing high heeled shoes generates more pressure per sq inch than a semi.

Paul Rohrs_4

Eiffel Tower

The Eiffel Tower has a foundation pressure of 58-64 psi. 7000 tons of steel, Talk about load distribution!


Regards,

PR

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hr

Some trucks

like the garbage trucks in the shop I heated, GVW at 56,000lbs. On 4 tires with a contact patch of about 12 square inches. If the truck were equally loaded on 4 tires, wouldn't that be 14,000 lbs per square foot?

Some how the slab does distribute the weight 45° outward from all edges. Something like that.

hot rod

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